Re: Retrieve the argument of a prior Ex mode command

Hello Paul,

Sorry for delay.. I didn't have the time to look into this further.

On Wed, Jan 18, 2012 at 03:12:18AM EST, Paul Isambert wrote:
> Chris Jones <cjns1989@gmail.com> a écrit:

> > At the bash prompt, I often use the [Alt+.] keyboard action to
> > retrieve the argument of a prior command from the bash history list.

[..]

> > Is there any way I could do this in Vim's ex-mode?
>
> This might be an overkill, and perhaps dangerous, but it seems to
> work:
>
> let s:CmdHistory = []
> let s:CmdCount = -1
> function! ResetCmd()
> let s:CmdCount = len(s:CmdHistory) - 1
> return ""
> endfunction
>
> function! StoreCmd()
> let cmd = matchstr(getcmdline(), '\s.\+')
> call add(s:CmdHistory, cmd)
> let s:CmdCount = len(s:CmdHistory) - 1
> return getcmdline()
> endfunction
>
> function! GetCmd()
> if s:CmdCount >= 0
> let cmd = matchstr(getcmdline(), '^\S*') . s:CmdHistory[s:CmdCount]
> let s:CmdCount = s:CmdCount - 1
> return cmd
> else
> return getcmdline()
> endif
> endfunction
>
> cnoremap <buffer> <CR> <C-\>eStoreCmd()<CR><CR>
> cnoremap <buffer> <Esc> <C-\>eResetCmd()<CR><Esc>
> cnoremap <buffer> <A-.> <C-\>eGetCmd()<CR>

That's _very_ useful, especially the mappings. I was not even aware of
the existence of '<C-\>e' function mappings and it would have taken me
ages to find that.

Thank you very much for going to all that trouble...!

I tried to simplify a bit and make the behavior as bash-alike as I could.

I came up with this:

| let g:indx=histnr("cmd")
|
| function! GetArg()
| let g:indx -= 1
| let s:cmdl = split(histget("cmd", g:indx))
| let g:arg = s:cmdl[len(s:cmdl)-1]
| return g:arg
| endfunction
|
| function! InitIndex()
| let g:indx=histnr("cmd")
| return ""
| endfunction

| cnoremap <M-.> <C-E><C-\>eGetArg()<CR>
| nnoremap : :<C-\>eInitIndex()<CR>

The main difference with your solution is that I directly access the Vim
command history via histnr() & histget() rather than maintaining my own
list of commands.

My effort basically works, except that when I hit 'Alt+.', whatever
I started to type on the Ex command-line gets overwritten instead of
being echoed at the current cursor position:

| :cd [Alt+.]

should for instance give me:

| :cd /home/user/.vim

but it gives me (e.g.):

| :/home/user/.vim

I first have to verify that this is not caused by something in my Vim
setup.

CJ

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